Speaking with the Bloomberg news service on the sidelines of the World Economic Forum in Davos, Switzerland, Adobe CEO Shantanu Narayen acknowledged that even after months of striving, a workable version of Flash for the iPhone remains a tough nut to crack.

"It's a hard technical challenge, and that's part of the reason Apple and Adobe are collaborating," Narayen told Bloomberg Television. "The ball is in our court. The onus is on us to deliver."

How much exactly are the two companies collaborating? Some reaction to the Bloomberg report has taken Narayen's words to suggest that Apple is pitching in like never before. But we've seen that kind of generality before in regard to Flash for the iPhone, dating back to March 2008, when Adobe first confirmed that it was working to bring Flash apps to the iPhone. And even then, it was apparent that this would not be a simple chore. As Adobe said at the time: "To bring the full capabilities of Flash to the iPhone Web-browsing experience we do need to work with Apple beyond and above what is available through the SDK (the iPhone software development kit) and the current license around it."